Why is rust forming on a car a chemical change?

What is the main reason why some developing countries fear the increase the free trade policies around the world?

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)

Which of the following molecules is polar? c3h7oh c2h5cooh